package com.lyl.controller;

/**
 * @author 李亚龙
 * @version 1.0
 */

import com.lyl.common.R;
import jakarta.servlet.ServletOutputStream;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

/**
 * 文件上传和下载
 */
@Slf4j
@RestController
@RequestMapping("/common")
public class CommonController {

    @Value("${reggie.path}")
    private String basePath;

    @PostMapping("/upload")
    public R<String> upload(MultipartFile file) {
        log.info(file.toString());
        //使用uuid重新生成文件名
        String originalFilename = file.getOriginalFilename();
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
        String newFilename = UUID.randomUUID().toString() + suffix;

        //创建一个目录对象,如果不存在则创建
        File dir = new File(basePath);
        if (!dir.exists()) {
            dir.mkdirs();
        }
        try {
            file.transferTo(new File(basePath + "桌面\\Java资料\\瑞吉外卖\\image_temp\\" + newFilename));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success(newFilename);
    }

    /**
     * 文件下载
     * @param name
     * @param response
     */
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){

        try {
            //输入流，通过输入流读取文件内容,从磁盘的文件读取到程序中
            FileInputStream fileInputStream = new FileInputStream(new File(basePath + "桌面\\Java资料\\瑞吉外卖\\image_temp\\" + name));
            //输出流，通过输出流将文件写回浏览器，在浏览器展示图片|-->将程序中的的流写到浏览器中
            ServletOutputStream outputStream = response.getOutputStream();
            //设置响应回去的文件类型
            response.setContentType("image/jpeg");
            int len = 0;
            byte[] bytes = new byte[1024];
            while((len = fileInputStream.read(bytes)) != -1){
                outputStream.write(bytes, 0, len);
                outputStream.flush();
            }
            //关闭资源
            outputStream.close();
            fileInputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

    }
}
